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2 SheetsSheet 1.

E. S. PIPER. MACHINE FOR HARDENING SAWS.

No. 65,598. Patented June 11, 1867.-

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2 Sheets- Sheet2.

E. S. PIPER. MACHINE FOR HARDENING SAWS.

Patented Juhe 11, 1867.

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EDWIN S. PIPER, OF INDIANAPOLIS, INDIANA, ASSIGNOR TO HIMSELF AND ATKINS AND CO., OF SAME PLACE.

Letters Patent .No. 65,598, dated June 11, 1867.

IMPROVEMENT IN HARDENING SAWS.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, EDWIN S. PIPER, of Indianapolis; in the county of Marion, and State of Indiana, have invented a new and improved Mode of Preventing Saw-Plates from springing during the Process ofHardening, and that I have also invented a machine to .apply this mode to all sizes and shapes of saws; and I do hereby declare that the following is a full, clear, and exact description of the mode and machine, 1'. -e., the mode of operation and the description ofthe machine, reference being had to the annexed drawings, making a part of this specification, in which- Figure A represents a perspective view.

Figures 1 and 2, longitudinal sections.

Figures 3 and 1, transverse sections.

Figures 5, 6, 7, and 8, parts of the machine.

The nature of my invention consists in constructing a machine for the purpose of hardening all kinds of saws, and all sizes, in such a manner as to prevent them from springing-during that process.

To enable others skilled in the art to make and use my invention, I will proceed to describe'its construction and operation.

I construct a cast-iron box, called hardening-trough A, with its necessary additions for slides, 860. This trough is shaped to accommodate straight and circular saws, and contains the hardening oil. Its size and shape are made to suit the requirements. To this box are fastened the slides 15 b, in whichtheframework c for the circular and straight saw-clamps slides up or down. I construct the framework E, which holds the circular saw-clamp F, in such a manner that the upper part of this. clamp F can be raised from the lower part, for which purpose it is made to slide in two slots in the framework E. This upper part of the clamp F is attached to a plunger, G, which is connected with two-knuckle-joints H H by means of one common pivot. The plunger is mortised out where these knuckle-joints join, to suit them. Oneend of one of these knuckle-joints is pivoted to the staple J, which is fastened to the framework I by means of a set-screw, so as to suit-the thickness of the saw to be hardened in the clamp D. The upper part of this-plunger G is provided with a hook, K, which hooks into the rim L on the cam M. The cam M is provided wi'th a lever, N, and works on a pivot in O, which passes through the upper framework P. The combined framework C (for the straight and circular saw) moves in the slides b b, .to which slides are attached iron rods, which are provided with spiral springs for lifting this frame G, with the saws, up, as soon as the pressure upon the lever N ceases. Bythis means the saws are raised out of the oil-trough after being hardened. S represents a bracket, fastened to 'the oil-trough. Upon this bracket reststhe double hock T, and acts as a fulcrum. The other end of theother knuckle-joint is attached to the inner half of the clampD, which is movable. The clamps are ,made of cast iron, like the balance of the machine. The insides of the clamps aremade of iron lattic'e work,-the laths ,set at an angle of thirty degrees.

' The edge of the lattice towards the saw is about one -sixteenth of an inch thick, and runs back to half an inch thickness. The space between the laths varies fromone and a'quarter to thr'ee-eighths of an inch. The guides on the long saws are screwed to the top of the clamps.

Operation.

To harden circular saws, the spiral springs will bepermitted to raise the framework 0 up, so as to bring the clamp for-circular saws on a level with the top of the hardening-trough. Raising up-the'lever N will make the little hook K on top of the plunger catch into the rim L on the cam M, and raise the plungerN, and with it the upper part of the clamp F, so as to permit the sawto he placed on the lower part of the clamp F. Pressing down the lever N to cramp the saw will raise up the other end of it, which will, on its passage up, catch into the upper part of the hook T, and acting as a fulcrum, will bear down upon the wholc framework. G, forcing it, with the saw, into the oil.

To harden long saws, the spiral springs are compressed to the extent so as to bring the clamp D to a level with the top of the hardening-trough A. The lever N in raised, and. draws the plunger G, with its knucklejoints, up by means of the hook K, which catches in the im L on cam M. whereby the clamp is opened for the saw. Pressing down the lever N to o'ramp' the sun will raise the other end of the lever, which will, on its passage up, catch in the lower part of hook T. Acting as fulcrum, it will bear upon the whole framework C, and force it and the saw into the oil.

What I claim, and desire to secure by Letters Patent of the United States, is-

1. The preventing of springing-of sews during the process of hardening.

2. The construction of the clamps; and

3. The eombination of the lever N, cam M, hookK, rim L, double hook T, plunger Ur, and knuckle-joints H H, with the clatnp D and clamp F, all. arranged and operating substantially as set forth, and for the purpose described.

EDWIN s. PIPER.

Witnesses:

JAS. WM. LOEPER, HENRY R. HUEBNER. 

